Malicious PDF — malware analysis report

Static analysis result for SHA-256 849f67684684fe6e…

MALICIOUS

PDF

79.9 KB Created: 2021-11-12 00:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 394f99117edd3bf1d14418fd96f4be9f SHA-1: 2393e7c7d2852ea95acb476542890f76f15160b7 SHA-256: 849f67684684fe6e86e36dc7e7da4b530d18499fe19c483ddd7a35a90443db59
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d38069f3f---18887628462.pdf In PDF document text
    • http://bearings-home.com/userfiles/file/7844364522.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/63974100090.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/rugezevixunax.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/54848709842.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/16378679561.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f91e2d492a57a5d6ea942643ac8c714c/40876907277.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/polebewemelaperanijarato.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/93982722936.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20211031151663218.pdfIn PDF document text
    • http://hakemokulkiyafetleri.com/upload/ckfinder/files/wipira.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/26348480175.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/54643192093.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617258bb4001c---13107364816.pdfPDF link annotation
    • http://jtylek.pl/Upload/file/60264941878.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/28267685989.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617595a4c67aa---76495336792.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/pusisusemimifenuliwa.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/15601078311.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/68821847028.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/juvewakogajetefofil.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/xadikawurazavagigurobom.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/50787757060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=pileated+woodpecker+tennesseePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 10684 bytes
SHA-256: 7a623fc24da39fb8c3db31ccf001828a116bffa48139ed7ac232774656b1ed42
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 17496 bytes
SHA-256: 163cb537b21635f49dd6d5ff8e6f8881a417622434ddcc7924ed86d098d4e6d4
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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